Edge trimmer



Jime 20, 1939., E DUNFORD 2,162,944

EDGE TRIMMER Filed Feb. ll, 1938 /7 /4 )la z j 32? Esse!!! i I l 'l' I l l l 6 lll l l I I /m/cw/of Patented June 20, 1939 PVATENT OFFiCE EDGE TRIMMER Ernest Dunford, St. Louis, Mo., assignor to Landis Machine Company, St. Louis, Mo., a corporation of Missouri Application February 11, 1938, Serial No. 189,939

8 Claims.

The invention relates to rotary cutters such as are used in shoe finishing machinery, and more particularly to edge trimmers used for trimming the faces of heels and heel taps.

Such cutters are frequently removed by the operator for redressing or replacing, and it is* one object of the invention to provide a secure mounting for such cutters and at the same time to facilitate their ready removal and replacement..

Such cutters usually involve guard devices and preferably such devices are yieldingly mounted relative to the cutter, and it is another object of the invention to mount the cutter and guard so that the removal of the cutter will not result necessarily in the removal of the guard but nevertheless the guard willalways be in functioning position when the cutter is-applied.

These and other detailed objects of the invention as will appear from the following description,

are attained by the structure illustrated in the accompanying drawing, in which- Figure 1 is a side elevation of an edge trimmer embodying the invention and shows the same applied to a shoe finisher tool shaft. Y

Figure 2 is a longitudinal section through the device as shown in Figure 1.

Figure 3 is an exploded view showing the parts in separated or extended position.

The frame I of the iinsher includes a bearing 2 for the journal 3 of the too-l shaft 4 having a threaded portion 5 and a spindle 6 extending forwardly therefrom and terminating in a shouldered portion 1 which is interiorly threaded at 8.v

The edge trimmer includes a cup-like casing 9, lthe closed end I9 of which is apertured and threaded interiorly to engage the threaded portion 5 of the shaft. The exterior of thecasmg is knurled as at Il'to aord a better grasp for the hand of the operator.

A sleeve-like spacer I2 is freely slid into 'shaft spindle 6 and has one end seated against the inner face of the casing end I0 and has its outer end I3 projecting beyond the open end of the casing.

A cutter I4 is freely slid onto shaft spindle 6 and includes a rim I5, the end of which may abut the end I3 of sleeve I2. The periphery of cutter I4 includes the usual teeth I5 having a familiar contour adapted for the work the cutter is to perform.

An outer disc guard and cutter retainer collar I1 has a central aperture fitting over the shouldered portion 'I of the shaft, and the inner face of guard I'I abuts against the outer end of the cutter and the periphery of the guard forms a thin disc projecting radially a short distance beyond the edges of the adjacent portions of the cutter teeth.

A retaining screw VI 8 is threaded to engage shaft threads 8 and is knurled to be easily grasped by the operator. Preferably screw I8 and shaftaperture 8 are threaded in the opposite direction to threaded portion 5 of the shaft, and preferably the threads o-f the screw and aperture 8 are relatively coarse.

The device is shown assembled with the associ-l l0 ated shaft in Figures 1 and 2 and it will be noted from Figure 2 particularly that there is provided a continued rigid thrust between the inner face of casing end Ill and the inner face of the head of screw I8, this thrust being transmitted through sleeve I2, cutter I4, and collar I1. By grasping shaft 4 with one hand and casing II with the other hand, the latter may be easily rotated on threaded portion 5 to relieve the pressure against sleeve I2, cutter I4, collar I'I and screw I8, where-*'20 upon screw I8 may be readily removed with the fingers and then collar Il and cutter I4 may be slid off of the shaft. This procedure may be reversed by applying the cutter, then guard I'I, then screw I8, and then tightening the parts by rea 25 versed rotation of casing 9. g

A cylindrical guard I9 is-slidable at all times over sleeve l2 and its outer end is provided with teeth 20 disposed to extend between cutter teeth I6 and, with annular rim ZI, to project radially 30 of the cutter beyond the edges of the cutter teeth.

A coiled spring 22 is compressed between the inner end of guard I9 and a flange 23 on the inner end of sleeve I2 and yieldingly thrusts guard I9 outwardly. When work is applied to the cutter, the 35 work may rest upon guard elements 20 and 2I and be yieldingly supported thereon, but sufficient pressure against the guard by a workman will move the latter, compressing spring 22, to permit the work to contact with the cutter teeth. 40

Preferably the outer periphery of guard I9 is grooved at 24 and a set screw 25 in casing I9 projects into groove 2'4 and limits the outward movement ofthe guard under the thrust of spring 22. Hence when screw I8, collar I'I and cutter 45 I4 are removed from the shaft, guard I9 will be limited in its outer movement, as shown in Figure 3, and will not be disassembled.

AY radial opening 26 through casing 9 permits the application of oil to the parts inside of the 50 casing so that guard I9 may slide easily on the other parts.

'Ihe device is simple to construct and assemble and the large diameter and extensive knurled surface of casing 9 renders it a comparatively v5g,

easy matter to rotate the casing into and out of position for thrusting sleeve I2 against the cutter. When pressure is removed from the cutter guard I'I and the head of screw I 8, the latter may be easily rotated with thumb and finger. When casing 9 is rotated to apply pressure to the sleeve cutter, retainer, and nut head, the parts are so tightly gripped that it is practically impossible for them to loosen except upon intentional retraction of the casing as described.

It will be understood that the outer retainer may take forms other than screw I8, for eX- able a bayonet joint or pin passing through the shaft, or other well known holding expedient could besubstituted for this screw.

Similarly the interengagement of casing 9 and the shaft could be effected by various latch or camming arrangements other than the threads described. It is not essential to each feature of the invention that the member I'I serves as a guard or that the spring-pressed guard I9 be included.

Other modifications of the details of the invention may be made without departing from the spirit thereof and the exclusive use of such variations as come within the scope of the claims is contemplated.

What is claimed is:

1. In an edge trimmer device, a cup-like casing with its end wall apertured and threaded teriorly for engagement with a shaft on which the device is to be mounted, the device including a sleeve receivable in said casing with one end disposed to abut the inner face of said casing end wall and projecting outwardly beyond the open end of said casing, a cutter adapted to be mounted on said shaft with a rear face opposing the outer end of said sleeve, and a retainer structure opposing the outer face of said cutter and adapted for threaded engagement with said shaft.

2. In combination with an operating shaft, a member threaded to said shaft inwardly from the end thereof, a spacer freely received on said shaft and abutting said member, a cutter freely received on said shaft and abutting said spacer, and a retainer structure abutting said cutter and threaded to said shaft, the threads between said shaft and member running in the opposite direction from the threads between said shaft and retainer structure whereby said spacerv is held against movement axially of the shaft solely by being gripped between said member and said retaining structure.

3. In an edge trimmer device, a sleeve adapted to freely receive a shaft on which the device is mounted, the device including a cutter adapted to freely receive said shaft and to abut one end of said sleeve, a cylindrical guard slidable over said sleeve and into functioning relation to said cutter, a casing enclosing said sleeve and guard und threaded to engage said shaft and having an end element opposing the other end of said sleeve, and a cutter retainer structure arranged to be detachably secured to said shaft at the side of the cutter opposite said sleeve.

4. In an edge trimmer device, a cutter, a oasng, a sleeve within said casing and projecting therefrom, abutting faces on said sleeve and cutter, a guard for one end of the cutter teeth slidable in said casing over said sleeve, a spring compressed between said guard and the inner end of said casing, a guard for the other end of the cutter teeth, and a member for retaining said latter-mentioned guard, portions of said member and casing being threaded for engagement with a shaft to which the device is applied, one of said portions being threaded righthand and the other of said portions being threaded lefthand.

5. In an edge trimmer device, a member apertured to fit over a shaft on which the device is mounted and including means for engagement with the shaft to effect positive movement of said member along the shaft, when the member is manually rotated on said shaft, the device including a cutter apertured for mounting on said shaft with one end opposing said member, a spacer between said member and cutter for limiting their movements towards each other, and a retainer arranged to be secured to said shaft at the other end of said cutter. v

6. A device as described in claim 5 which also includes a guard adjacent one end of said cutter and means yieldingly thrusting said guard towards the cutter independently of movement of the member towards the cutter.

3o 7. In combination with an operating shaft, an

edge trimmer cutter slidably received on'said shaft, members slidably received on said shaft at opposite ends of said cutter and movable towards each other to positively clamp the cutter between them, a yguard movably mounted on one of said members, and means thrusting said guard into functioning position relative to the cutter teeth.

8. In an edge trimmer device, a cutter, a hol- 4 low casing having an inner end wall, a sleeve within said casing and projecting therefrom to abut the end of said cutter, a guard for the corresponding end of the cutter teeth slidable in said casing over said sleeve, a spring compressed between said guard and said inner end wall of said casing and thrusting said guard outwardly of said casing, elements on said .guard and casing limiting the outwardy movement of saidguard when the cutter is removed, said cutter, casing,- sleeve and guard being apertured for application to a shaft, and a member arranged to be detachably secured to such a shaft and to engage the other end of said cutter to oppose the thrust of said spring and guard on said cutter.

ERNEST DUNFORD. 

